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<?php
/**
* Joomla! Content Management System
*
* @copyright Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Crypt\Cipher;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Crypt\CipherInterface;
use Joomla\CMS\Crypt\Key;
use ParagonIE\Sodium\Compat;
/**
* JCrypt cipher for sodium algorithm encryption, decryption and key generation.
*
* @since 3.8.0
*/
class SodiumCipher implements CipherInterface
{
/**
* The message nonce to be used with encryption/decryption
*
* @var string
* @since 3.8.0
*/
private $nonce;
/**
* Method to decrypt a data string.
*
* @param string $data The encrypted string to decrypt.
* @param Key $key The key object to use for decryption.
*
* @return string The decrypted data string.
*
* @since 3.8.0
* @throws \RuntimeException
*/
public function decrypt($data, Key $key)
{
// Validate key.
if ($key->type !== 'sodium')
{
throw new \InvalidArgumentException('Invalid key of type: ' . $key->type . '. Expected sodium.');
}
if (!$this->nonce)
{
throw new \RuntimeException('Missing nonce to decrypt data');
}
$decrypted = Compat::crypto_box_open(
$data,
$this->nonce,
Compat::crypto_box_keypair_from_secretkey_and_publickey($key->private, $key->public)
);
if ($decrypted === false)
{
throw new \RuntimeException('Malformed message or invalid MAC');
}
return $decrypted;
}
/**
* Method to encrypt a data string.
*
* @param string $data The data string to encrypt.
* @param Key $key The key object to use for encryption.
*
* @return string The encrypted data string.
*
* @since 3.8.0
* @throws \RuntimeException
*/
public function encrypt($data, Key $key)
{
// Validate key.
if ($key->type !== 'sodium')
{
throw new \InvalidArgumentException('Invalid key of type: ' . $key->type . '. Expected sodium.');
}
if (!$this->nonce)
{
throw new \RuntimeException('Missing nonce to decrypt data');
}
return Compat::crypto_box(
$data,
$this->nonce,
Compat::crypto_box_keypair_from_secretkey_and_publickey($key->private, $key->public)
);
}
/**
* Method to generate a new encryption key object.
*
* @param array $options Key generation options.
*
* @return Key
*
* @since 3.8.0
* @throws RuntimeException
*/
public function generateKey(array $options = array())
{
// Create the new encryption key object.
$key = new Key('sodium');
// Generate the encryption key.
$pair = Compat::crypto_box_keypair();
$key->public = Compat::crypto_box_publickey($pair);
$key->private = Compat::crypto_box_secretkey($pair);
return $key;
}
/**
* Set the nonce to use for encrypting/decrypting messages
*
* @param string $nonce The message nonce
*
* @return void
*
* @since 3.8.0
*/
public function setNonce($nonce)
{
$this->nonce = $nonce;
}
}
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